Abstract
Phase equilibria in the MnSe–Ga2Se3 system were re-investigated by differential thermal analysis (DTA) and X-ray diffraction (XRD) methods and its phase diagram was constructed, which somewhat differs from that presented earlier in the literature. It was established that the system is characterized by the formation of an intermediate phase (ã) with a wide (47–61 mol % Ga2Se3) homogeneity region. Based on Ga2Se3, a wide (~30 mol %) areas of solid solutions was also found. It is shown that the ã-phase undergoes a polymorphic transformation ã′↔ã at 1183 – 1193 K for various compositions. The high-temperature ã′-phase has a minimum melting at 1205 K and 55 mol% Ga2Se3 and is in peritectic equilibria with solid solutions based on both initial binary compounds. Based on powder diffraction data, the tetragonal lattice parameters of the ã-phase with compositions of 50 and 60 mol % Ga2Se3 were determined. The previously indicated ternary compound of the Mn2Ga2Se5 composition was not been confirmed. A comparative analysis of the obtained results with literature data was carried out.
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